A George Home was executor to Henry de C Hamilton in 1940, probably him.
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This birth entry in Scotland is all that can be found:

Surname  Forename  Gender  Year  Ref        RD Name
HOME     GEORGE    M       1874  685/2 306  St Andrew (Edinburgh)

and this baptism is probably for the same person:

First name(s)           George
Last name               Home
Gender                  Male
Birth year              1874
Birth place             Edinburgh,Midlothian,Scotland
Father's first name(s)  Bruce James
Father's last name      Home
Mother's first name(s)  Isabella
Mother's last name      Watson
Place                   Edinburgh
County                  Midlothian
Country                 Scotland
Record set              Scotland Births & Baptisms 1564-1950
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But in Lt-Col George Hamilton’s book “The House of Hamilton” this George is named as George Horne of Deli, Sumatra.
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This “Hume” may be is death index, it corresponds with the probate index:

Surname  Forename  Age at death  Mother's Maiden Name  Year  Ref          RD Name
HUME     GEORGE    74                                  1948  644/18 1033  Pollok
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His probate index:

Home of Cairndinnes near Haddington East Lothian died 31 October 1948 Confirmation of Lorna Margaret de Courcy Hamilton or Home and Patrick Bruce Hamilton Home and Robert Johnston Wightman writer to the Signet.
Sealed London 22 January [1949].
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Their marriage is not to be found on FreeBMD; in Scotland?

Nor is it to be found in FindMyPast’s or Scotland’s People’s records.